The superstar couple's company filed trademark documents for the names on 26 June at the United States Patent and Trademark Office. The adorably different names will apparently be used for merchandising various baby products. At just a few weeks old, it seems these famous twins will already be earning their keep!

Beyoncé was reported to have given birth to Rumi and Sir on 17 June. Her father Matthew Knowles also announced the birth of his grandchildren on Twitter -- which induced plenty of angry buzzing from the Beyhive.

The now family-of-five are said to have set up a home in Malibu, which they will be renting for $400 000 (R5,2 million) a month for the rest of the US summer.